A basic disk cannot contain more than FOUR "primary" partitions. You've already got four allocated... even though you have unallocated space (66GB in the middle of the drive and then also a small 102MB at the extreme right end) that you'd like to make into a new partition.
You can't do that right now, because you can' allocate another partition.
However, you can restructure your drive, to accomplish what you want... as well as to open the door to even more partitions in the future, if you want to.
The solution is that you have to convert the 68GB unallocated space with 141GB E partition to its right (which is currently a "primary" partition) to be part of one large "primary" partition consisting of both areas (i.e. about 209GB combined), but referred to as the "extended partition". This is a special type of "primary" partition which supports ANY NUMBER of "logical" partitions then sub-defined inside of it.
Once the "extended partition" is defined, then you can sub-define any number of logical partitions inside of it. The plan here is to thus convert your "primary" E partition to a "logical" E on the right side of the "extended partition" space. And then you will define a new "logical" partition" in the unallocated space on the left side of the "extended partition".
First, you need to
download and install [free] Partition Wizard Home Edition v6.0.
You also need to
download the matching ISO from which you can burn a standalone bootable CD of Paritition Wizard. This standalone bootable CD can be used to do anything the program can do under Win7, but it can also perform operations on your boot partition C, which the version under Win7 can't do immediately but must be performed only after you first re-boot to allow completion.
Anyway, I believe that the partition restructuring you want to do to your drive can be done while under Win7. Or, if you want, you can also do it from the standalone boot CD.
So... first step is you need to "convert from primary to logical" partition type, for your E partition. Once you're in Partition Wizard, if you select that E partition you should see "set partition as logical" as one of the operations on the left side of the screen. Or, you select the E partition and right-click on it and you should see the same option.
I haven't done something like you're wanting to do so I don't know if that unallocated space immediately to the left of where E is will simply be incorporated into the one large "extended partition" and then your E will be make "logical" inside of it with the free space to its left simply being unallocated within the "extended partition" from which you can then create a second logical partition", or if you'll have to do all of this in several steps.
Worst case, you probably will be offered the option to resize the partition as well, and you can add all of the current unallocated space to its left to E, converting it into one large "logical" E partition of 141+66=207GB, taking up all of what is now the "extended partition" (replacing your current unallocated space plus what was the E primary partition).
Then, you can re-size E to back to what it was, freeing up that 66GB again as unallocated... but definitely now inside of the "extended partition".
And now you can create a new "logical" partition inside of that unallocated space inside the "extended" partition.
You can do this all with Partition Wizard, in what I hope are the intuitive steps I've described above. I've tried to be clear, but if you have any questions please ask first.
I think you'll find the GUI of Partition Wizard to be very intuitive and easy to understand. You simply specify your operations in advance and they get "queued up" in the bottom left corner. If you change your mind or make a mistake, you can UNDO one operation at a time from the queued list. Eventually, you push the APPLY button and it all is performed in sequence. Then you can start over, with a new list of queued operations, etc.
As you specify your operations to be performed the pictures of your drive will change to show you what it WILL look like eventually... but the operations themselves have not been applied yet, and can still be undone from the queued list. Only after you push the APPLY button and they are performed and completed, are they actually performed and completed.
I have 100% confidence in PW, but you might want to first be sure you have adequate data backups if there's anything critical that you would be devastated about if you lost... say if the electricity went off in the middle of the operations.
